Heater for preheating milk



March 24, 1931. R. B. BAGBY HEATER FOR PREHEATING MILK 2 Sheets-Sheet 1 f. v m M E 5 $1 H| .Q h.\% fl 3 WT Q 9 MM WT v N w March 24, 1931. BAGBY 1,797,312-

HEATER FOR PREHEATING MILK Filed March 22, 1929 2 sheets-sheet 2 Patented 'Mar. 24, 1931 p RALPH B BAGVBY', or cHIGA oQ ILLINOIS" HEATER- ro PREHEArIno MILK 1 Application filed: March 22, 1929.; Serial No S49QO24.

' This invention relates to heaters which can be advantageously used for pre-heating milk for filtering or for separating.

One of the objects of the invention isto ti provide a heater of simple construction which can be operated economically for heating milk while it is moving through a coil and Without involving manual handling of the milk.

vide a heater 'for pro-heating milk comprising a a milk pipe coil enclosed within a water pipe coil,"the circulation of the milk and the water being maintained in opposite directions to secure the maximum degree of heat transfer.v a V i g Q And aofurther object or the invention isto utilize steam for heating and maintaining a circulation of hot water 'in a tube "enclosing 2 another tube through which a flowof milk is induced and controlling the steam inlet, and the milk flow to deliver. the milk data predetermined temperature." l

, And a still further object of theinvention is to provide a coil for heating milk wherein themilk tube is enclosed Within a larger tube through which a flow of hot water is maintained in a direction oppositeto the flow of milk and delivering the heated milk directly 3-0 7 into a, filter connected with the milk pipe to Fig.3 {is a vertical sectionalview onthe a I c line 3-3 of Fig. 1; and V iis 'a'detailsectional view on the line MofFig. w v H l I Referring to the drawings, the invention comprises a suitable base which may conveniently consist of the standards 5+5 connected by a tie rod 6.. In the embodiment. shown the water j; coil comprises a' plurality or straight pipes 7 arrangedin parallel re'latightly secured in the headers. pipe 7 is larger than'theother pipes to A further obj ect of the invention is to pro- "Water up from the bottom pipe pipe 14 tozthe -top pipe 7 by "creating a sucareconnected at their ends in'pai'rsbybends tion' one above the other and securedat their ends in headers 8-by bolts passed through flanges 9 fixed on or unitary with the'pipes to niake water tight joints." I prefer topro-' videthese flanges 'Withslotted ears 10 to" receive the boltsll by which the pipes are The lower form a water reservoir, andthis pipe is provlded W1t l 1fi COCk'12 fordrainlng the water .coil; The headers 8 at each end or the coil are arrangedone'up-on the other and fastened together bybolts 1.3' and they form, in effect, a headerat each end of the water coil'lna'de up of indep'endent sections boltedtogether, 35

each section receiving the, ends of two pipes and'fforming aconnectio'n therebetween. I To maintain a circulation of water through the c'oil,' I provide a; suction lift. at one end of the coil to lift theiwater fromfthe bottom coil to thetopicoih and this suction lift comprises a pipe ll'whi'ch is connected by a pipe 1 5'with theheade'r 8 for the bottom pipe "7 by a pipe 16 Witlithe header for the top pipe.

Thesuction 'lift' pipe 14 is-contr'acted at14 and is provided with a'valved steaininlet' pipe 17' and a valved Water inlet pipe 17' at itslower end; Inthe normal operation of the heaterthe steam jet will induce a flow of 7' through the tion liftwhich'xizill. maintain a constant cir- 'c ulatio'n of the Water. A bent overflow pipe '18 *is connectedwith the top header section atthe endof' the coil opposite the suction lift pipe. plug19 having an opening'120 therein "is arranged: at thetop of the overflow pipe to provi'de a conveniently located 'airivent'for the Water coil; A milkpipe 21 is arranged in each of the water pipes 7 and C3 projects through the header sections at the ends ofsaid water pipes'and is secur'edwater tightby packingglands 22. {The milk pipes 23 seating against interposed gaskets 24 and secured in place by screw clampsf25i. The milkpipes are centrally disposed within the watergpipes and th'e lower milk pipe hasa valved -inlet.connection 26,. I The top milk pipe connects witha filter 27 which maybe Cal supported conveniently above the coils by the to milk pipe andby a rod 28 engaged with a bracket 29 on one of the headers. mometer 30 is mounted on the top of the suction lift pipe 14 and another thermometer 31 is located at the inlet to the filter.

In practice the water supply valve is opened and the water coil is filled. with water until it overflows at the overflow pipe 18, whereupon the watersupply valve is closed. Then the steam valve is opened gradually, very little steam being required, and it induces a circulation of water through the pipes of the water coil and asuction lift in the pipe 14 to maintain this circulation. Then the milk coil supply valve is opened and the milk flows through the pipes of the milk coil in a reverse direction to the flow of water through the water coil whereby the maximum degree of heat transfer from the water to the milk is obtained. By observing the milk thermometer 31 and the water thermometer 3Q'and regulating the milk flow and the steam supply the m k may be mainta ned at a des temperature such as 90 E. which is considered desirable for filtering or clarifying purposes. It will be apparent that a higher or lower temperature may be maintained for any purposes desired by properly controlling the milk and steam supplies. In practice it has been found that with the milk supply at .F. and with a steam pressure of 5.0 lbs. per

square inch the heater will heat the milk to 90 F. at an approximatevrateof 7,500 lbs. perhour. The capacity of the heater will vary with the temperature of themilks-upply and the steam pressure used. After the valves have'been set to obtain the desired milktenr perature the heater will continue to operate automatically without further attention; it is noiseless in operation and it heats the milk to the desired temperature rapidly and efliciently. The overflow pipe is bent and vented to prevent siphoning action on the water while still affording an eflicient overflow. The filter is conveniently located, shown and described, at the top of the coils supported at one end upon the milk coil pipe and at its other end upon one of the headers, but it may be located beneath the coil or separated therefrom, as will be readily understood, The milk pipes are preferably made ofsanitary tinned copper tubing rolled tightly into nickel silver headers 32; to which the clamps 25 are pivotally connected. Gaskets Qt are interposed between the headers 32 and thereturn bends 23 to prevent leakage. The return bends are also preferably made ofnic'kel silver machined inside to eliminate crevices or obstructions which mightprevent the free flow of; milk. The water pipes are preferably made of steel held in place by cast iron head er all (if he p k g gamma pref e ably'made of malleable "iron andprovided A therwith slotted ears and fastening bolts for convenience in assembling and adjusting.

lVhile the invention is particularly adapted for preheating milk for filtering, it can be used for many other purposes as will be readily apparent to those skilled in the art.

The construction of the heater is such that it can be easily flushed and cleaned and maintained in sanitary condition, and it can be easily taken apart for repair or replacement and reassembled without special skill.

, I have shown the invention in a commercial form which I have found satisfactory in actual practice, but I reserve the right to make all such changes in the form, construction and. arrangement of parts of my invention which may be necessary for different installations or otherwise desirable, within the scope of the following claims.

I aim: V

,1. A heater comprising a plurality of pipes C nn c d togeth to m a i containing a hea ingfiuid, another plura ity of pipes enclosed within said heating fluid pipes and connected. t ge her to form a. il for a fluid lbe heat m ans fo admitting he fluid to. be heated at one end of its coil and inducmg a flow f said. ui h o gh sa d c and u a ts he d, an m n f r fndu ins a constant circulation of the heating fluid in its coil.

2. A heaterv comprising .a plurality of pipes connected together to form a coil containing a heating fluid, another plurality of pipes enclosed within said heating fluid" pipes and connected together to form a coil for a fluid to be heated,.means for admitting the fluid to be heated at one end of its coil and inducing a flow of said fluid through said coil, and means for inducing a circulation of the heating fluid in its coil in a reverse direction to the flow of the fluid to be heated in its coil.

3. A heater comprising a plurality of pipes connected together to form a coil containing a heating fluid, another plurality of pipes enclosed within said heating fluid pipes and connected together to form a coil for a fluid to be'heated, means for admitting the fluid to be heated at one end of its coil and inducing a flow of said fluid through said coil and out at its other end, and a suction liftfor inducing a flow of heating fluid from the bottom pipe to the top pipeand a constant circulation of the heating fluid in its coil. 7

4. A heater comprising a plurality of pipes connected together to form a coil containing a heating fluid, another plurality of plpes'enclosed within said heating fluid pipes and conn cte tog the o fo tm'a cell fo a luid to be heated,, neans or admitting he {fluid to b ated a one en of its co l and inducing a flew 0. .5 sai fl through aid toi a suctio l ft pineconnect d with cadet he ba te p pe an ith the correpipes connected together to form a coil containing a heating fluid, another plurality of pipes enclosed within said heating fluid pipes and connected together to form a coil for a fluid to be heated, means for admitting the fluid to be heated at one end of its coil and inducing a flow of said fluid through said 0011, and means for inducmg a irculatlon of the heating fluid in its coil, the bottom pipe of said heating fluid coil being enlarged to provide a water reservoir.

6. A heater comprising a plurality of pipes arranged one above the other in par- 1 allel relation, headers connecting said pipes together in pairs at their ends to form a coil containing a heating fluid, another plurality ofpipes enclosed within said heating fluid pipes and projecting through and beyond'said headers, bends secured on the ends of said enclosed pipes and connecting them the other of said branches is opened, said heating fluid coil including an overflow discharge outlet comprising a conduit having a bend therein, said conduit being Vented at said bend to provide anair outlet whereby siphoning will be prevented.

' 'RALPI-I B. BAGBY;

together in pairs to form a coil for a fluid to be heated, means for admitting the fluid to be heated at one end of its coil and inducing a flow of said fluid through said coil, 7

and means for inducing a circulation of the heating fluid in its coil in a reverse direction to the flow of the fluid to be heated in its coil.

7. A heater comprising a plurality of pipesconnected together to form a coil con- "taining a heating fluid, another plurality of pipes enclosed within said heating fluid pipes and connected together to form a coil for a fluid to be heated, means for admitting the fluid to be heated at one end'of its coil and inducing aflow of said fluid through said coil and out at its other end, an inlet for the heating: fluidcoil including opposed valve controlled branches adapted to be alternate- 1y opened whereby a fluid may be introduced into said coil when one of said branches is open and whereby said fluid may be caused to circulate ,by "steam admitted thereinto when the other. of said branches is o ened.

8. A heater comprising a plurality o pipes connected together to form a coil containing a heating fluid, another plurality of pipes enclosed within said heating fluid pipes and connected together to form a coil for a fluid tobe heated, means for admitting the fluid to be heated at one end of its coil and inducing a flow of said fluid through said coil and outat its other end, an inlet for the heating fluid coil including opposed valve controlled branches adapted to he alternately opened whereby a fluid maybe introduced into said coil when one of said branches is 'i open whereby said" fluid may be caused to'circulate by steam admitted thereinto when 

